My story is very similar to yours - I had 2 m/c in 2008, one in July and another one in October. I found out I was pg again on Valentine's day 2009 and like you, I also tested positive for Strep B. My midwife told me that there was nothing to worry about, they'd give me antibiotics as soon as I'm in labour. When I went into labour, they gave me intravenous antibiotics every four hours until the baby was born and she is now 16 months old.